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How do we use velocity curves (obtained from spectroscopy to show that some extrasolar planets are close to their host stars?

User Pbanka
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The velocity curve is such in which the x-axis is the velocity and the y is the time. The distance traveled by the object is calculated by multiplying velocity and time. Thus, in the velocity curve, the distance can be easily calculated if we know where to look. 
User Axes Grinds
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